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Proceedings Paper

Parameterized source term in the diffusion approximation for enhanced near-field modeling of collimated light
Author(s): Mengyu Jia; Shuang Wang; Xueying Chen; Feng Gao; Huijuan Zhao
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Paper Abstract

Most analytical methods for describing light propagation in turbid medium exhibit low effectiveness in the near-field of a collimated source. Motivated by the Charge Simulation Method in electromagnetic theory as well as the established discrete source based modeling, we have reported on an improved explicit model, referred to as "Virtual Source" (VS) diffuse approximation (DA), to inherit the mathematical simplicity of the DA while considerably extend its validity in modeling the near-field photon migration in low-albedo medium. In this model, the collimated light in the standard DA is analogously approximated as multiple isotropic point sources (VS) distributed along the incident direction. For performance enhancement, a fitting procedure between the calculated and realistic reflectances is adopted in the nearfield to optimize the VS parameters (intensities and locations). To be practically applicable, an explicit 2VS-DA model is established based on close-form derivations of the VS parameters for the typical ranges of the optical parameters. The proposed VS-DA model is validated by comparing with the Monte Carlo simulations, and further introduced in the image reconstruction of the Laminar Optical Tomography system.

Paper Details

Date Published: 7 March 2016
PDF: 11 pages
Proc. SPIE 9706, Optical Interactions with Tissue and Cells XXVII, 97061F (7 March 2016); doi: 10.1117/12.2214722
Show Author Affiliations
Mengyu Jia, Tianjin Univ. (China)
Shuang Wang, Tianjin Univ. (China)
Xueying Chen, Tianjin Univ. (China)
Feng Gao, Tianjin Univ. (China)
Tianjin Key Lab. of Biomedical Detecting Techniques and Instruments (China)
Huijuan Zhao, Tianjin Univ. (China)
Tianjin Key Lab. of Biomedical Detecting Techniques and Instruments (China)

Published in SPIE Proceedings Vol. 9706:
Optical Interactions with Tissue and Cells XXVII
E. Duco Jansen, Editor(s)

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